Folding box

1. A foldable box comprising:

a bottom part folded inwardly by at least one bottom folding hinge, said bottom part comprising at least one first bottom plate and second bottom plate that are connected to each other by the bottom folding hinge;

a front side part connected to a front side of said bottom part;

a rear side part connected to a rear side of said bottom part;

a rigid left side part connected to a left side of said bottom part and folded inwardly by at least one left side folding hinge; and

a rigid right side part connected to a right side of said bottom part and folded inwardly by at least one right side folding hinge, wherein said left side part and said right side part each have a flexible side part formed of a non-rigid material, said left side part and said right side part being positioned at a lower area of the left and right side folding hinges respectively, wherein when said left side part and said right side part are folded inwardly and the first bottom plate and the second bottom plate are folded inwardly at the same time, opposite side surfaces of each of the first and second bottom plates are folded inwardly while contacting the flexible side part so as to not interfere with a path to which said left side part and said right side part are folded inwardly.

2. The folding box of claim 1 , wherein said left side part has a first left side panel and a second left side panel that are connected to each other by the left folding hinge and folded inward, wherein said right side part has a first right side panel and a second right side panel that are connected to each other by the right folding hinge and folded inward.

3. The folding box of claim 2 , wherein the first left side panel, the second left side panel, the first right side panel, and the second side panel are of a trapezoidal shape.

4. The folding box of claim 1 , wherein one or more rear wheels are affixed to a lower side of the rear side part.

5. The folding box of claim 4 , wherein one or more front wheels are affixed to the lower side of the front side part.

6. A folding box comprising:

a bottom part folded inwardly by at least one bottom folding hinge;

a front side part connected to a front side of the bottom part;

a rear side part connected to a rear side of the bottom part;

a left side part connected to a left side of the bottom part and folded inwardly by at least one left folding hinge;

a right side part connected to a right side of the bottom part and folded inwardly by at least one right folding hinge, wherein the left side part and the right side part each have a flexible side part formed of a soft material located at a lower area of left folding hinge and the right folding hinge respectively so as to allow the bottom part to be folded inwardly when the left side part and the right side part are folded inward, wherein the left folding hinge has a left hinge magnet and the right folding hinge has a right hinge magnet.

7. A folding box comprising:

a bottom part folded inwardly by at least one bottom folding hinge;

a front side part connected to a front side of the bottom part;

a rear side part connected to a rear side of the bottom part;

a left side part connected to a left side of the bottom part and folded inwardly by at least one left folding hinge;

a right side part connected to a right side of the bottom part and folded inwardly by at least one right folding hinge, wherein the left side part and the right side part each have a flexible side part formed of a soft material located at a lower area of left folding hinge and the right folding hinge respectively so as to allow the bottom part to be folded inwardly when the left side part and the right side part are folded inward, wherein the bottom folding hinge has a bottom hinge spring and a spring case so as to provide an elastic force to the bottom folding hinge when the bottom part is folded inwardly.